Check-valve



' Patented Sept. 21, 1886.

Q mmmm INVENTOR WQ BY MA I ATTORNEYS III/II (N0 odel.)

,of the case,) but which may be at the bottom UNITED STATES PATENT OFFICE.

ADAM DAVIS GLAOE, OF ROCKLIN, CALIFORNIA.

CHECK-VALVE.

EJPECEFiCAf-ION forming part of Letters Patent No. 349,586, dated September 21, 1886.

' Application filed June E2, 1886. Serial No. 203.902. (No model.)

To all whomit 'may concern.-

Be it known that I, ADAM DAVIS GLAOE, of Rocklin, in the county of Placer and State of California, have invented a new and Improved Check-Valve, of which the following is a full, clear, and exact description.

My invention relates to valves adapted to check the back flow or pressure of fluids, and it has for its object to provide a simple, inexpensive valve of this character, which will close positively to cut off a back pressure or current of fluid, thereby promoting the durability of the valve, and avoiding an overheating of an injector or inspirator employed to force water through the valve, as when feeding steam-boilers, and preventing waste of. any fluid passed through the valve.

The invention consists in certain novel features of construction and combinations of parts of the check-valve, all as hereinafter fully described and claimed.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a vertical sectional elevation of my improved check-valve. Fig. 2 is a vertical section of the valve, taken at right angles to Fig. 1. Fig. 3 is a vertical sectional elevation of the triple disks separated from each other, and Fig. 4 is a cross-section through the stem of the upper disk of the valve.

The body or case A of the valve is internally chambered at B, and is provided with an inlet, 0, (shown at one side near one end of the case. A11 outlet, D, is provided near the other end of the case, in which end is fitted a screw cap or plug, E, giving access to the interior of the case. Suitable pipes, c d, are

- fitted, respectively, to the inlet and outlet 0 D,

as in Figs. 1 and 2. About at its center the wall of the valve-case chamber B is made tapering or inclined, preferably to an angle of about thirty-five degrees, to forma seat,-b, upon which close the three check-disks F G H of the valve. The bored stem f of the disk F is provided with longitudinally-ranging exterior ribs, f, four ribs being shown, which fit within a bore, 6, of the case cap or plug E, and guide the check-disks in the cap. The

the disk G, all as most clearly shown in Fig.

2 of the drawings. p

The operation of the valve is as follows: \Vhen water, steam, or other fluid is admitted at the inlet (3, the valve-disk H will open about one-eighth of an inch, and then will strike the disk G and raise it a like distance to the disk F, which then will open for any required distance to pass the fluid to the out let at D, whence it escapes. When the feed is shut off, the back-pressure will be held by the disk F closing to the valve-seat b, and the disks G and H also will seatthemselves by gravity. Should the disk F happen to be held from a tight closure by dirt, grit, or other matter on the disk or its seat,the disk G will tightly close the valve, and should dirt or grit also prevent a perfect seating of the disk G there is yet another chance of a tight closure of the valve by the perfect seating of the disk H; consequently a practically perfect closure of this.checkvalve may at all times be depended upon. The opposing faces of the disks F G H are ground to fit closely to each other as the valve opens,

and whereby fluid will be excluded from the extraneous matter on the valve disk or plate and its seat, a current of fluid-particularly steam-passing through the valve will quickly wear grooves in the valve disk or plate or its seat, and make a regrinding or refitting of the valve necessary, and when check-valves of this last-named class are fitted in pipes for feeding steam-boilers and do not close tightly, the back-pressure of hot water leaking past them overheats an injector or inspirator used to feed the boiler and renders it inoperative or seriously impairs its efl'ective action, so that the feed of water to the boileris irregular and unsatisfactory, thereby giving much trouble to enginemen, particularly the engineers of locomotive-engines; hence my improved triple check-valve is especially adapted for use in pipe-connections through which boiler-feed water is forced by an injector or inspirator. It is evident that if the disk F, or both disks F G, should fail to close tightly and the disk G or H should so close there can be no fiuid-current through the valve; hence the partially unseated disks and their place of seating in the valve-case will not be worn as in the ordinary check-valve, and the next time fluid is allowed to pass through the valve the extraneous matter which has lodged on the disks or seat will be washed through, and will allow the valve to close tightly again by the seating of the disk F. This feature of the valve is important, as it not only assures a tight closure of the valve, but promotes its durability, and makes repairs or refitting of the valve necessary only after very long use of the valve.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is- I l. A check-valve made with a chambered case provided with an inlet and an outlet, atapering seat arranged between the inlet and outlet, and two or more valve-disks guided in the case and adapted to the tapering seat thereof, substantially as described,for the purposes set forth.

2. A check-valve made with a chambered case provided with an inletand an outlet, atapering seat arranged between the inlet and outlet, a recessed removable cap or plug fitted to the case, and two or more valve-disks, one having a hollow stem fitted to slide in the cap, and the stems of the valve-disks fitting loosely into each other, and said disks'adapted to the tapering seat of the valve-case, substantially as described, for the purposes set forth.

3. The combination, in a check-valve, of a chambered case, A, provided with a tapering seat,b,an inlet, Gand an outlet, D, aremovable cap, E, recessed at e, a disk, F, having a hollow stem, f, provided with ribs f, and fitted in the cap-recess 0, and an auxiliary disk, as at G, fitted by its stem g in the stem of disk F, said disks F G adapted to the tapering seat 0 of the valve-case,substantially as described,-

for the purposes set forth.

4. The combination, in a check-valve, of a chambered case, A, provided with a tapering seat, b, an inlet, 0, and an outlet, D, a re movable cap, E, recessed ,at e, a disk, F, having a hollow stem, f, provided with ribs f, and fitted in the cap-recess e, a disk, G,having a hollow stem, 9, fitted in the stem f of disk F, and a disk, H, having a stem, h, fitted in the stem 9 of disk G, and said disks F G H adapted to the tapering seat I) of the valvecase, substantially as described, for the purposes set forth.

ADAM DAVIS G-LAOE.

Witnesses:

HEN Y E. STAFFORD, ALBURN M. STAFFORD. 

